On 11/11/2025 in Maerkang, Sichuan, the approach to the Hongqi Bridge collapsed. The bridge fell a few hours after landslides, without causing any casualties. Preventively closed the day before by authorities, this recent structure was key for the connection to Tibet. However, it gave way under the instability of a slope. Investigation ongoing: understanding the chain of events and geotechnical factors.
What We Know About the Collapse
On 11/11/2025, a partial collapse affected the Hongqi Bridge in Maerkang (Barkam), Sichuan. The structure had been closed the day before by authorities. Indeed, cracks and deformations had appeared on the neighboring slope. When the slope deteriorated in the middle of the afternoon, landslides occurred. They tore away the access bridge and the embankment. A cloud of dust enveloped the gorge. No casualties were reported: barriers were in place and the area was cordoned off.
This bridge in China is part of a route connecting the heart of the country to the Tibetan plateau. Its length would reach 758 m. Local authorities mention slope instability as the most probable cause. An investigation is underway to clarify the mechanisms and possible combination of factors (geology, water, recent works, traffic).
A Recent Chinese Bridge on a Key Route to Tibet
The Hongqi Bridge was delivered a few months before the incident and positioned on a strategic section of a national road that runs from Chengdu to Tibet via the G317. This transversal, 2,028 km long, crosses passes, valleys, and high plateaus, linking rural territories and urban centers. It constitutes, along with other connections, one of the arteries for opening up western China and the Tibetan and Qiang prefecture of Aba.
Locally, the bridge spans a relief carved by a tributary of the Dadu He, near the Shuangjiangkou hydroelectric project, whose dam is set to become one of the highest in the world. The road developments in this sector have been redesigned according to hydroelectric projects and bank reconfigurations.
Landslides: A Living Mountain
The Maerkang area is located on the eastern edges of the Tibetan plateau, a mountainous space where altitude, tectonic folds, and climatic contrasts interlock. The slopes react sharply to cycles of freeze-thaw, rain, and anthropogenic stresses. Landslides are part of the "normal" functioning of these reliefs. They can remain discreet or, as here, mobilize sufficient volumes to destabilize a recent infrastructure.
In practice, a bridge does not collapse "by surprise" when weak signals are detected in time. Here, the alert was given on 10/11/2025: cracks snaked across the roadway and movements were detected on the slope. The police and municipal services closed access, evacuated vehicles, marked off, and prohibited any intrusion. The next day, the kinematics accelerated: the mountain slid, the approach cracked, gave way, and the dust rose.
Preventive Closure: A Bridge Accident Avoided
Timing matters. The decision to close the day before changed the outcome. With no traffic at the time of the collapse, no motorists were trapped on the structure. The images, striking, show the extent of the instability: sections of embankment collapsing, access deck disintegrating, piles sinking into the mineral chaos. The scene is brief, a few seconds. Then the dust settles, leaving a scar in the landscape.
At this stage, the investigation favors a geotechnical sequence: slope instability → landslides → failure of the approach structure and the roadway slab. It will need to specify whether erosion related to ongoing works contributed to the failure. Additionally, underground water flows or previous floods could be involved. Finally, it will check if unforeseen constraints played a role. Authorities avoid any hasty conclusions about a structural defect of the bridge itself.
Who Does What: Authorities and Constructor
The municipal authorities of Maerkang coordinate the securing and diversion traffic. The Aba prefecture leads the assessment of the slope and the monitoring of residual risks. The structure was built by the Sichuan Road & Bridge Group (SRBG), a major public player in infrastructure projects in western China. The company indicates it is collaborating on the technical findings and the provision of documents. Furthermore, it provides execution plans, earthwork reports, and monitoring data useful for the investigation.
On the ground, teams conduct surveys and monitor micro-seismicity as well as surface deformations. Additionally, they check the stability of the remaining sections. The immediate goal: avoid a secondary accident, protect personnel, reopen connections for residents and emergency services.
A Vital Route, Traffic to Reorganize
The closure of the affected section calls for detours via mountain roads. Heavy vehicles are redirected and passage windows are defined for essential supplies. Authorities do not provide a timeline for a return to normal traffic. First, the slope must be stabilized and unstable blocks cleared. Then, a new embankment must be terraced and the access bridge rebuilt.
Beyond that, the episode reminds us of the fragility of the corridors connecting Sichuan and Tibet. Each pass, each gorge is a sensitive point. Engineers now design these structures as systems: structures, drainage, sensors, nailed walls, and rockfall barriers. The challenge is to absorb the mountain’s movement, not to deny it.
Viral Images, Contained Emotions
The videos circulate, angular, shaky. One sees the approach bending, the roadway opening, the slope crumbling. Comes the dull noise, then a veil of dust. The eye returns to the river, to the piles. The sequence creates astonishment. But the absence of victims imposes a calm reading: here, prevention worked.
Bridge Collapse: Investigation and Responsibility, No Hasty Conclusions
Investigators will reconstruct the chronology and cross-reference data: recent weather, rainfall, deformation measurements, construction reports, layer geometry. They will verify hypotheses of cumulative superficial slides. Additionally, they will examine a localized rupture in a weakness plane. Finally, they will assess an insufficiently anchored cut/fill. Any implication of an intrinsic defect in the structure must be based on evidence. Until then, caution prevails.
For now, the official information is summarized in a few lines: preventive closure, landslides, collapse of the approach and embankment, no injuries. The rest is a fieldwork that will take time.
Sidebar — Understanding
• Geology of Sichuan: at the edges of the Tibetan plateau, the slopes are active. Freeze-thaw, rain, earthquakes, and works alter the balance of the terrain. Landslides are frequent and sometimes rapid.
• Route to Tibet: the G317 connects Chengdu to Naqu. A 2,028 km axis, it crosses passes and valleys at over 2,500 m altitude. It is essential for trade and supply to the high valleys.
• Preventive Closures: in the face of signs (cracks, settlements, slope movements), the police and managers can block traffic, evacuate, and monitor. It is the key to limiting human risks.
Useful Landmarks and References
– Maerkang (Barkam): district city of Sichuan, at 2,615 m altitude. – G317 (Chinese national road): transversal Chengdu–Naqu. – Shuangjiangkou Project: large dam nearing completion on the Dadu He. – Sichuan Road & Bridge Group: public engineering company based in Chengdu.
Beyond the Shock: Maintenance, Sensors, Vigilance
This type of event refers to maintenance and monitoring practices that are rapidly evolving in the massifs. Managers now combine inspection of structures (sensors for inclination, deformation, pore pressure), remote sensing (photogrammetry, LiDAR), and regular patrols. The data feed into alert thresholds. Consequently, they trigger preventive closures when parameters deviate from a range deemed safe. The G317, like other mountain roads, benefits from being thought of as a "corridor": not just a roadway, but a system of supports, drainage, and ancillary structures, integrated into the local geodynamics.
The Hongqi Bridge episode does not, by itself, speak to the quality of Chinese engineering. It reminds us that, in unstable reliefs, risk tolerance is decided collectively. This includes the choice of routes, investments in protective structures, and the installation of sensors. Moreover, the regulation of traffic and the culture of detour are essential when the mountain demands it.
What Next for the G317 and the Hongqi Bridge?
A new bridge gave way to a moving mountain. Anticipation avoided a human tragedy. It remains to understand the chain of causes, stabilize the slope, and rethink the approach. In these reliefs, infrastructure is never an isolated object: it lives with the terrain, its waters, its seasons, its memory. The case of the Hongqi Bridge reminds us of this forcefully — without exaggeration, but with gravity.